ht of (A) plus (B) of at least one member selected from the group consisting of(1) styrene, (2) an ester having the structure ##STR10## wherein R1 is hydrogen, an alkyl group having from 1 to 4 carbon atoms, or a halogen, and R2 is an alkyl group having from 1 to 6 carbon atoms, (3) an alpha-olefin having the structure ##STR11## wherein R' and R are alkyl groups having from 1 to 7 carbon atoms, (